am 67c7a4ae: Merge "Fix off-by-two and other bugs in the visualization code....

    // derive capture scaling factor from peak value in current buffer

    // this gives more interesting captures for display.

    int32_t shift = 32;

    for (size_t i = 0; i < inBuffer->frameCount; i++) {

    int len = inBuffer->frameCount * 2;

    for (size_t i = 0; i < len; i++) {

        int32_t smp = inBuffer->s16[i];

        if (smp < 0) smp = -smp;

        if (smp < 0) smp = -smp - 1; // take care to keep the max negative in range

        int32_t clz = __builtin_clz(smp);

        if (shift > clz) shift = clz;

    }

    // never scale by less than 8 to avoid returning unaltered PCM signal.

    // add one to combine the division by 2 needed after summing left and right channels below

    if (20 > shift) {

        shift = (31 - 8 + 1) - shift;

    } else {

        shift = (3 + 1);

    // A maximum amplitude signal will have 17 leading zeros, which we want to

    // translate to a shift of 8 (for converting 16 bit to 8 bit)

     shift = 25 - shift;

    // Never scale by less than 8 to avoid returning unaltered PCM signal.

    if (shift < 3) {

        shift = 3;

    }

    // add one to combine the division by 2 needed after summing left and right channels below

    shift++;

    uint32_t captIdx;

    uint32_t inIdx;

         inIdx < inBuffer->frameCount && captIdx < pContext->mCaptureSize;

         inIdx++, captIdx++) {

        int32_t smp = inBuffer->s16[2 * inIdx] + inBuffer->s16[2 * inIdx + 1];

        smp = (smp + (1 << (shift - 1))) >> shift;

        smp = smp >> shift;

        buf[captIdx] = ((uint8_t)smp)^0x80;

    }

    pContext->mCaptureIdx = captIdx;